package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.exception.DishDisableFailedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 新增菜品功能
     * @param dishDTO
     */
    @Transactional
    @Override
    public void saveWithFlavor(DishDTO dishDTO) {
        // 插入1条dish数据
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.insert(dish);
        Long dishId = dish.getId();

        // 插入n条dish_flavor数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() != 0){
            flavors.forEach(flavor->{
                flavor.setDishId(dishId);
            });
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    @Override
    @Transactional  // 多条SQL语句或多表操作记得开启事务
    public void deleteBatch(List<Long> ids) {
        // 判断菜品能否删除，当前逻辑是：只要其中有不能删的，那么就全都不删
        // 判断菜品是否启售
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if(dish.getStatus() == StatusConstant.ENABLE){  // Integer包装类型最好用equal来比较
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        // 判断菜品是否被套餐关联
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if(setmealIds != null && setmealIds.size() > 0){
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        // 删除菜品数据 -- 存在问题：多次数据库操作会降低性能
        // for (Long id : ids) {
        //     dishMapper.deleteById(id);
        //     // 删除菜品关联的口味数据
        //     dishFlavorMapper.deleteByDishId(id);
        // }

        // 根据菜品id集合批量删除菜品和对应口味数据
        dishMapper.deleteByIds(ids);
        dishFlavorMapper.deleteByDishIds(ids);
    }

    /**
     * 根据id获取菜品及对应的口味
     * @param id
     * @return
     */
    @Transactional
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        // 根据id获取菜品
        Dish dish = dishMapper.getById(id);
        // 根据菜品id获取口味数据列表
        List<DishFlavor> flavors = dishFlavorMapper.getByDishId(id);
        // 封装成dishVO对象
        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish, dishVO);
        dishVO.setFlavors(flavors);
        return dishVO;
    }

    /**
     * 更新菜品及对应口味
     * @param dishDTO
     */
    @Transactional
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        // 更新菜品数据
        dishMapper.update(dish);
        // 删除菜品对应的口味数据
        Long dishId = dishDTO.getId();
        dishFlavorMapper.deleteByDishId(dishId);
        // 新增菜品对应的口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if(flavors != null && flavors.size() > 0){
            flavors.forEach(flavor->{
                flavor.setDishId(dishId);
            });
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 启售停售菜品
     * @param status
     * @param id
     */
    @Transactional
    @Override
    public void startOrStop(Integer status, Long id) {
        // 若有包含该菜品的套餐在启售，则不能停售该菜品
        List<Long> ids = new ArrayList<>();
        ids.add(id);
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if(setmealIds != null && setmealIds.size() > 0){
            int statusCount = setmealMapper.countByIds(setmealIds);
            if(status == StatusConstant.DISABLE && statusCount > 0){
                throw new DishDisableFailedException(MessageConstant.DISH_DISABLE_FAILED);
            }
        }

        Dish dish = new Dish();
        dish.setId(id);
        dish.setStatus(status);
        dishMapper.update(dish);
    }

    /**
     * 根据分类id查询菜品
     * @param dish
     * @return
     */
    @Override
    public List<Dish> list(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);
        return dishList;
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    @Transactional
    @Override
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }

        return dishVOList;
    }

}
